<?php

namespace App\Http\Controllers;

use GuzzleHttp\Client;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Log;

class VersionController extends Controller
{
	const CACHE_TIME = 10;							// Time to cache version

	const GL_PROJECT = 2;							// Gitlab project number
	const GL_URL = 'https://dev.dege.au/api/v4';	// Gitlab URL

	const VERSION_REGEX = '/^v([0-9]+\.[0-9]+\.[0-9]+(\.[0-9]+)?)-([a-z]{3})-([a-z0-9]{8})$/';

	public function main(Request $request,string $version=NULL) {
		// Our version is in the format of either:
		// v1.2.3-xxx-abcdef01
		Log::info(sprintf('Connection from [%s] reporting version [%s]',$this->getUserIpAddr(),$version));

		$matches = [];
		if (preg_match(self::VERSION_REGEX,$version,$matches)) {
			// If xxx is "dev" we are a development version
			switch($matches[3]) {
				case 'dev':
					$current = Cache::remember('dev',self::CACHE_TIME,function() {
						$client = new Client;
						$url = sprintf('%s/projects/%d/repository/commits',self::GL_URL,self::GL_PROJECT);

						$response = $client->request('GET',$url,['form_params'=>['ref_name'=>'BRANCH-2.0','order'=>'default']]);

						if ($response->getStatusCode() === 200) {
							$result = collect(json_decode($response->getBody()));

							return $result->first();
						}

						return NULL;
					});

					if ($current) {
						$repository = sprintf('v%s-rel-%s',$matches[1],$current->short_id);

						// Find the tag associated with version $matches[1] and see if it is more recent than $matches[4]
						return ($matches[4] === $current->short_id) ? ['current'=>$repository] : ['upgrade'=>sprintf('v%s-%s-%s',$matches[1],$matches[3],$current->short_id)];

					} else
						return ['unknown'=>'vn.n.n-dev-hhhhhhhh'];

				case 'rel':
					$current = Cache::remember('dev',self::CACHE_TIME,function() {
						$client = new Client;
						$url = sprintf('%s/projects/%d/repository/tags',self::GL_URL,self::GL_PROJECT);

						// Find the tag associated with version $matches[1] and see if there is a more recent version number
						$response = $client->request('GET',$url,['form_params'=>['ref_name'=>'master','sort'=>'desc']]);

						if ($response->getStatusCode() === 200) {
							$result = collect(json_decode($response->getBody()));

							return $result->first();
						}

						return NULL;
					});

					if ($current) {
						$repository = sprintf('v%s-rel-%s',$current->name,$current->commit->short_id);

						// If $matches[1] is smaller, "upgrade available"
						if ($matches[1] < $current->name)
							return ['upgrade'=>$repository];

						// If $matches[1] is the same, validate that $matches[4] is current and the same and if not, error
						elseif ($matches[1] === $current->name)
							return ($matches[4] === $current->commit->short_id) ? ['current'=>$repository] : ['mismatch'=>$repository];

						// if $matches[1] is higher, abort
						else
							return ['unknown'=>$repository];

					} else
						return ['unknown'=>'vn.n.n-rel-hhhhhhhh'];
			}
		}

		// Return the current version
		return ['unknown'=>'vn.n.n-xxxx-hhhhhhhh'];
	}

	public function getUserIpAddr(): string
	{
		if (isset($_SERVER['HTTP_CLIENT_IP']))
			$ipaddress = $_SERVER['HTTP_CLIENT_IP'];
		else if(isset($_SERVER['HTTP_X_FORWARDED_FOR']))
			$ipaddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
		else if(isset($_SERVER['HTTP_X_FORWARDED']))
			$ipaddress = $_SERVER['HTTP_X_FORWARDED'];
		else if(isset($_SERVER['HTTP_FORWARDED_FOR']))
			$ipaddress = $_SERVER['HTTP_FORWARDED_FOR'];
		else if(isset($_SERVER['HTTP_FORWARDED']))
			$ipaddress = $_SERVER['HTTP_FORWARDED'];
		else if(isset($_SERVER['REMOTE_ADDR']))
			$ipaddress = $_SERVER['REMOTE_ADDR'];
		else
			$ipaddress = 'UNKNOWN';

		return $ipaddress;
	}
}